Everything is just Orange. Shockwave missing beats
Since there is a lot going on I'm going to break it down into bullets.

The black A: Lights don't go across layers. Layer one with the A has no lights causing the A to be black.

Everything is orange because you only have one render layer and do the compositing to the whole scene. You need to make a non orange render layer and have it alpha over in the compositor. See the below images:


Settings for orange layer. Notice how only the second layer is selected.

Settings for non orange layer. Notice how only the first layer is selected. Also turn OFF sky.

I'm not sure why you have additional compositing to the viewer I ignored that. Coming out of your current final node use an alpha over to combine the render layers.


I don't do audio in Blender so I can't help you there.